A bit O' dismay...

While tidying up some lose hoses under my van this
afternoon I discovered a bit of coolant colored goo on
one of the hardlines & believe this is why I've been
having to top things off about once a month...

Where I'm going with this is the replacements appear
to be plastic (Bus Depot) and mine are metal.  What's
the life span for the plastic and are they as robust?

Thanks,
Brian

PS

This is a gas tank drop job isn't it?